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利用两种土石料三轴CD试验数据确定两组椭圆-抛物双屈服面模型参数,研究了模型参数α、KG、n、h、m、M1、M2和pr分别单独变化(而其他参数保持不变)对模型所反映的土的应力-应变关系的影响。结果表明,土体的体积应变对参数h、m比较敏感;α、KG、n对剪胀性土的体变影响较大,而对剪缩性土体变影响不明显;α、KG、n、h和m对模型反映的强度没有影响;pr变化对体变和强度影响均较小。M1和M2对强度和体变均有显著影响,且M1和M2中的小值决定模型的强度。定义了灵敏度,即一种用于表示模型参数对其所反映的应力-应变的影响程度的参数。分析表明,不同的参数,其灵敏度差异很大;不同的土类,参数灵敏度差异也较大。实际应用时,对灵敏度大的参数取值应特别慎重。
The parameters of two groups of elliptical-parabolic dual yield surfaces were determined by using three kinds of soil-rock triaxial CD test data. The model parameters α, KG, n, h, m, M1, M2 and pr were individually changed Effect of the model on the stress-strain relationship of soil. The results show that the volumetric strain of soil is more sensitive to the parameters h and m; α, KG and n have a greater influence on the body deformation of dilatancy soil, while the effect on the shear strength of soil is not significant; α, KG, n , H and m have no effect on the intensity reflected by the model; the effect of pr on volume change and intensity is small. M1 and M2 have a significant effect on both intensity and volume change, and the small values in M1 and M2 determine the intensity of the model. The sensitivity is defined as a parameter that indicates how much the model’s parameters affect the stress-strain it reflects. Analysis shows that the sensitivity of different parameters is very different; different soil, the parameters of the sensitivity difference is also large. Practical application, the parameters of the sensitivity of the value should be particularly careful.